LG 55m6700 picture has become real bright when you first turn on

LG 55m6700 picture has become real bright when you first turn on

I have a LG 55m6700 and lately it picture has become real bright when you first turn on the unit, and the other day lines popped up on the screen for a second , I have checked the power saver? and adjusted any picture resets. The tv is 10 yrs old is there a easy fix? or is it time for a new TV What is the life of a smart large screen tv?

ANSWERS: